TAKO. INTERNET SEIT 1996.
Olympus-OM

Re: [OM] And for a change of pace - Spinning Girl

Subject: Re: [OM] And for a change of pace - Spinning Girl
From: Philippe <philippe.amard@xxxxxx>
Date: Thu, 25 Sep 2014 21:19:19 +0200
Black magic !

Stunned Philippe


Le 25 sept. 2014 à 21:13, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> a écrit 
:

> From CH's reply I have to say not all the time.  But if it's bad it certainly 
> does.  If the histogram is drawn from a JPEG it will have 256 bars for each 
> shade of each color.  If the posterization is bad it will show spaces where 
> some bars are totally missing.  You can't create posterization by reducing 
> brightness but you can easily create it by pushing shadows up too far.  For 
> example:  Take 3 low brightness values: 3, 4 and 5.  Push them up by 2 stops 
> which requires multiplying by 4. The result is 12, 16 and 20.  What were 
> previously contiguous values now have gaps in between... holes in the 
> histogram.
> 
> Chuck Norcutt
> 
> 
> On 9/25/2014 2:55 PM, Philippe wrote:
>> Does posterization really show in a histogram?
>> 
>> Amities
>> Philippe, always eager to learn.
>> 
>> Le 25 sept. 2014 à 15:06, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> a 
>> écrit :
>> 
>>> If there's posterization it's pretty minor.  If I load it into PS and view 
>>> the histogram (even by individual color channel) there's nothing that jumps 
>>> out at me.
>>> 
>>> And, by the way, Ken, I liked those severely punished pixels.
>>> 
>>> Chuck Norcutt
>>> 
>>> 
>>> On 9/24/2014 7:20 PM, C.H.Ling wrote:
>>>> Nice! I like the color and tone. It seems to have some posterization,
>>>> don't know if this can be avoided.
>>>> 
>>>> C.H.Ling
>>>> 
>>>> ----- Original Message ----- From: "Ken Norton" <ken@xxxxxxxxxxx>
>>>> 
>>>> 
>>>>> Enough of the tie dye stuff. Here is an artistic shot from a photo
>>>>> shoot last year that the model has finally signed off on.
>>>>> 
>>>>> Processed as a combination of Lightroom and Picasa. This is a heavily
>>>>> cropped shot from the Panasonic DMC-L1. I think the lens was the
>>>>> 14-42.
>>>>> 
>>>>> http://zone-10.com/tope2/main.php?g2_itemId=14577
>>>>> 
>>>>> Oh, and Chuck, the pixels have been severely punished, so don't expect
>>>>> to figure out the quality of the lens, sensor, yada yada.
>>>>> 
>>>>> AG
>>>> 
>>> --
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